c.dns.cn has no CNAME records.
Question and response
Question
dig c.dns.cn. NS
Answer
The response has no answer records.
Authority
dns.cn. 8122 SOA a.dns.cn. root.cnnic.cn. 2023110101 3600 600 1209600 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0